Bottle cap



FIG. 1 is a perspective view of a bottle cap, embodying my new design;

FIG. 2 is a top view thereof;

FIG. 3 is an elevational view thereof;

FIG. 4 is an elevational view similar to that of FIG. 3, but rotated 10° about the vertical axis; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a bottle cap, as shown and described. 